Re: 2.4 vm, program load, page faulting, ...

wind-lkml
2003-03-17T17:00:44Z

On Mon, Mar 17, 2003 at 07:50:04PM +0300, Alex Tomas wrote:
> >>>>> wind (w) writes:
>
> w> On Mon, Mar 17, 2003 at 11:01:31AM -0500, Rik van Riel wrote:
> >> On Mon, 17 Mar 2003, William Lee Irwin III wrote:
> >> > On Sat, 15 Mar 2003, Paul Albrecht wrote:
> >> > >> ... Why does the kernel page fault on text pages, present in
> >> the page > >> cache, when a program starts? Couldn't the pte's for
> >> text present in the > >> page cache be resolved when they're
> >> mapped to memory?
> >> >
>
> w> You should ask Andrew about his patch to do exactly that: he
> w> forced all PROC_EXEC mmaps to be nonlinear-mapped and this forced
> w> all programs to suck entire binaries into memory... I recall he
> w> saw at least 25% improvement at launching gnome.
>
> they talked about pages _already present_ in pagecache.

I wonder if this could be done by walking and faulting
all pages at fs/binfmt_elf.c::elf_map just after do_mmap...
will try it just now :)